JALÂL – جلال
Literally means majesty, grandeur, glory, dignity, greatness and power. Being great, illustrious and exalted in dignity and majesty.
As an Islamic term: Jalâl means Allah's being glorious in His majesty. Indescribable astonishing majesty of Allah. Any Ilahî attribute of might or wrath as distinguished from Jamâl.
As a term of ‘Ilm al-Kalâm: The manifestation of Janâb-i Haqq’s grandeur and wrath. Because of His Jalâl, He is imperceptible and incomprehensible by the senses and feelings of man.
The reason for the positioning of the Names اَلرَّحْمنِ الرَّحِيمِ and being mentioned together with the Lafza-i Jalâl: just as from the Name اَللّه which is Lafza-i Jalâl, Glory (Jalâl) with its chain manifests, so does Beauty (Jamâl) with its chain manifest from the Names اَلرَّحْمنِ الرَّحِيمِ (Ar-Rahmân Ar-Rahîm). Since Glory and Beauty are two roots and sources when they start to manifest in each ‘âlam, branches originating from them come into existence like command and prohibition, reward and punishment, encouraging and threatening, tasbîh and tahmîd, fear and hope and so on…
Signs of Miraculousness-Surah Al-Fâtiha